Check Your Body Mass Index and Health Risk Level
Enter your height and weight below to calculate your BMI and find out your weight category, health risk level, and ideal weight range based on WHO and CDC guidelines.
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Disclaimer: This calculator is based on WHO and CDC BMI guidelines and is intended for informational purposes only. BMI is a screening tool and is not a substitute for professional medical advice.
Results may not be accurate for athletes, older adults, or those with high muscle mass. Always consult your healthcare provider for a complete health assessment.
What Is BMI and How Is It Calculated?
BMI is a number calculated from your height and weight. The formula divides your weight in kilograms by the square of your height in meters. Despite its simplicity, it has been validated across decades of research as a useful screening tool for identifying weight-related health risks in the general adult population.
The World Health Organization and the CDC use the following categories for adults aged 20 and older:
Underweight is a BMI below 18.5. Normal or healthy weight falls between 18.5 and 24.9. Overweight ranges from 25.0 to 29.9. Class I obesity covers 30.0 to 34.9, Class II obesity covers 35.0 to 39.9, and Class III or severe obesity is defined as a BMI of 40 or above.
Each category carries different health implications, and the calculator tells you exactly which one applies to you.
How to Use the Calculator
Enter your weight and select your preferred unit — kilograms or pounds. Enter your height in centimeters or feet and inches. Add your sex and optionally your age, then click calculate. Your BMI, category, health risk level, and ideal weight range will appear instantly. You can also download your full result as a PDF to keep or share with your doctor.
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Why BMI Matters for Your Health
On the other side, a BMI below 18.5 is also a concern. Being underweight can indicate malnutrition, hormonal imbalances, weakened bones, and reduced immune function. It is a health risk that is often overlooked but taken just as seriously by clinicians.
For those in the overweight or obese range, even modest weight loss makes a measurable difference. According to the American Heart Association, losing just 5 to 10 percent of your body weight can meaningfully improve blood glucose levels, blood pressure, and cholesterol — reducing your risk of serious disease without requiring dramatic changes.